Improved molder s flask



` UNITED STATES PATENT OFFICE.

LAURESTONR. LIVINGSTON, JOHN J. ROGGEN, AND CALVIN ADAMS, OF

PITTSBURG, PENNSYLVANIA. v n

iMPRovEDMoLoERs FLASK.

To all whom, it may concern.-

Be it known that we, LAUREsToN R. LIV- INGSTON, JOHN J. ROGGEN, andCALvIN ADAMs, of Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and Improved Molders Flask; and we dohereby declare the following to be Ya full,clear, and exact descriptionthereof, reference being had tothe accompanying drawings, making a partof this specification, in which Figure l represents in perspective theupper and lower parts of our iiask united with a mold formed therein.Fig. 2 represents the parts thereof separated containing theirrespective portions of the mold, and Fig. 3 the form of the mold after.the flask has been with-` drawn therefrom.

Similar letters indicate like parts in all the figures.

rIhe nature of our invention consists in giving the sides ot' the flaskan inward inclination from the bottom of itslower portion, A, commonlycalled the drag, to the top of its upper portion, B, commonly called thecope,7 for the purposeof enabling the mold'er to withdraw the flask fromthe mold formed therein, and using the same flask for forming any numberof molds.

We generally cast the respective parts of our improved ask of iron. e eare the guiding-pins rising from each end of the drag A. d d are earscast with or boltedfto each end of the cope B, having apertures formedtherein into which the guiding-pins e e accurately Jit when the cope isplaced upon the drag, therebyV retaining the two parts of the ilasktogether in the usual manner. c c are ears cast upon or ,secured to thesides and ends of the cope in the position shown in Fig. 1. kk are pinsprojecting downward from the under sides of the ears c c. b b aresliding plates secured to the under sides of the ears c c by means ofslots in the plates, the edges of which iit into notches in the sides ofthe pins 7c 7c, on which the plates slide freely out and in. Recessesare cast or formed in the lower edge of the ends and sides of the cope,through which the sliding plates b b can be forced into the mold.

The process of molding in our improved lask is substantially the same asis pursued in molding with the ordinary forms of flasks.

Previous to packing the sand in the cope of our improved iiask thesliding plates b b are forced inward into the positions represented inFig. 2, which serve to retain the sand therein while the cope is liftedfrom the drag to withdraw the patterns and finish the mold.

After finishing the faces of the respective porv tions of the mold thecope is placed upon the drag and the sliding plates b b are Withdrawninto the positions represented in Fig. 1. Both portions of the `flaskare then withdrawn from the mold, leaving it of the form represented byFig. 3, and are again used for forming other molds.

Our improved tlasksmay be made of a rectangular, curved, or any otherform that may be desired, the gist of our invention consisting in givingthe sidesof both portions (the cope and drag) of our improved ask ani'nward inclination from bottom to top, making the top of each portionsmaller than its base,

so that they can be raised from the mold f formed therein., withoutinjuring the same, g

and also the combining with the upper portion or cope of the flask asuitable number of sliding plates or their equivalents for retaining thesand therein when the cope is removed from the drag, for the purposeherein de scribed.

We shall sometimes combine sliding plates with the drag of our improvedflask should it be found necessary.

Having thus fully described our improved molders ask, what we claimtherein as` new, and desire to secure by Letters Patent,

The inclining of the sides of the upper and lower portions thereofr(commonly called the cope77 and drag7) inward from bottom to top, incombination with the sliding plates b'b,

or their equivalents, connected therewith, substantially in the mannerand for the purpose

